hf::mcp9700 Namespace Reference

Classes
class	Mcp9700Thermistor
	Template driver for MCP9700 family sensors on a multiplexed ADC. More...

Enumerations
enum class	Error : uint8_t {   kNone = 0 , kNotInitialized , kInvalidArgument , kInvalidCoefficients ,   kAdcError , kOutOfRange }
	Why the last call failed (see Mcp9700Thermistor::LastError()). More...

Variables
constexpr float	kDefaultVoltsAtZeroC = 0.5F
	Default output voltage at 0 °C (500 mV typical, MCP9700/MCP9700A).
constexpr float	kDefaultVoltsPerCelsius = 0.01F
	Default sensitivity (10 mV/°C typical).
constexpr float	kDefaultSpecifiedMinCelsius = -40.0F
	Default lower end of the specified temperature range (°C).
constexpr float	kDefaultSpecifiedMaxCelsius = 125.0F
	Default upper end of the specified temperature range (°C).
constexpr float	kDefaultRangeMarginCelsius = 8.0F
	Default plausibility margin (°C) added on both sides of the specified range.

Enumeration Type Documentation

Error

enum class hf::mcp9700::Error : uint8_t

strong

Why the last call failed (see Mcp9700Thermistor::LastError()).

Enumerator
kNone	The last call succeeded.
kNotInitialized	Read before a successful Initialize(), or after Deinitialize().
kInvalidArgument	Null adapter or null output pointer, or an invalid range.
kInvalidCoefficients	Offset not finite, or slope not a finite positive number.
kAdcError	EnsureInitialized() returned false or ReadChannelV() returned non-zero.
kOutOfRange	The voltage is outside the plausible range: open, shorted or mis-scaled input.

Variable Documentation

kDefaultRangeMarginCelsius

constexpr float hf::mcp9700::kDefaultRangeMarginCelsius = 8.0F

inlineconstexpr

Default plausibility margin (°C) added on both sides of the specified range.

Covers the worst-case sensor accuracy of the MCP9700 (-4 °C / +6 °C, DC Electrical Characteristics) plus a little ADC error. With the default coefficients a reading is accepted from -48 °C (20 mV) to +133 °C (1.83 V); an open or grounded input (0 V, -50 °C) is rejected.

kDefaultSpecifiedMaxCelsius

constexpr float hf::mcp9700::kDefaultSpecifiedMaxCelsius = 125.0F

inlineconstexpr

Default upper end of the specified temperature range (°C).

kDefaultSpecifiedMinCelsius

constexpr float hf::mcp9700::kDefaultSpecifiedMinCelsius = -40.0F

inlineconstexpr

Default lower end of the specified temperature range (°C).

MCP9700/9700A/9700B: -40 °C to +125 °C (DS20001942, Temperature Characteristics). Over that range VOUT is 100 mV to 1.75 V (Section 3.2).

kDefaultVoltsAtZeroC

constexpr float hf::mcp9700::kDefaultVoltsAtZeroC = 0.5F

inlineconstexpr

Default output voltage at 0 °C (500 mV typical, MCP9700/MCP9700A).

kDefaultVoltsPerCelsius

constexpr float hf::mcp9700::kDefaultVoltsPerCelsius = 0.01F

inlineconstexpr

Default sensitivity (10 mV/°C typical).